<template>
    <div>
          <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>
        <el-card>
            <!-- 头部警告区 -->
            <el-alert
                title="注意 ：只允许为第三级参数设置相关参数 !" type="warning" :closable="false" show-icon>
            </el-alert>
            <!-- 选择商品分类区域 -->
            <el-row>
                <el-col>
                    <span>选择商品分类 :</span>
                    <!-- 选择商品分类的选择框 -->
                     <el-cascader
                        v-model="selectedCateKeys"
                        :options="catelist"
                        :props="cateProps"
                        @change="handleChange">
                    </el-cascader>
                </el-col> 
            </el-row>
             <!-- tab页签区域 -->
             <el-tabs v-model="activeName" @tab-click="handleTabClick">
                 <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type='primary' size='mini' :disabled='isBtnDisabled' @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data='manyTableData' border stripe>
                        <el-table-column type='expand'>
                             <template slot-scope="scope">
                                 <!-- 循环渲染tag标签 -->
                                 <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"  closable @close='handleClose(i,scope.row)'>{{item}}</el-tag>
                                 <!-- 输入文本框 -->
                                 <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                             </template>
                        </el-table-column>  
                        <el-table-column type='index' label='#'></el-table-column>  
                         <el-table-column label='参数名称' prop='attr_name'></el-table-column>  
                         <el-table-column label='操作'>
                           <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size='mini'  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete"  size='mini' @click="removeParams(scope.row.attr_id)">删除</el-button>
                           </template>  
                        </el-table-column>  


                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <!-- 添加属性的按钮 -->
                     <el-button type='primary' size='mini' :disabled='isBtnDisabled' @click="addDialogVisible=true">添加属性</el-button>
                      <!-- 静态参数表格 -->
                    <el-table :data='onlyTableData' border stripe>
                        <!-- 展开行 -->
                        <el-table-column type='expand'>
                             <template slot-scope="scope">
                                 <!-- 循环渲染tag标签 -->
                                 <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"  closable @close='handleClose(i,scope.row)'>{{item}}</el-tag>
                                 <!-- 输入文本框 -->
                                 <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                             </template>
                        </el-table-column>  
                        <el-table-column type='index' label='#'></el-table-column>  
                         <el-table-column label='属性名称' prop='attr_name'></el-table-column>  
                         <el-table-column label='操作'>
                           <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size='mini' @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete"  size='mini' @click="removeParams(scope.row.attr_id)">删除</el-button>
                           </template>  
                        </el-table-column>  
                    </el-table>
                </el-tab-pane>
            </el-tabs>

        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog
            :title="'添加'+titleText"
            :visible.sync="addDialogVisible"
            width="50%" @close='addDialogClose'>
           <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 点击编辑,弹出修改参数的对话框 -->
        <el-dialog
            :title="'修改'+titleText"
            :visible.sync="editDialogVisible"
            width="50%" @close='editDialogClose'>
           <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return {
            // 商品分类列表
            catelist:[],
            // 级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                expandTrigger: 'hover' ,
                children:'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys:[],
            // 默认激活的页签
            activeName:'many',
            // 动态表格数据
            manyTableData:[],
            // 静态表格数据
            onlyTableData:[],
            // 控制添加对话框的显示
            addDialogVisible:false,
            //添加参数的表单数据对象
            addForm:{},

            // 添加表单的验证规则对象
            addFormRules:{
              attr_name:[ { required: true, message: '请输入参数名称', trigger: 'blur' },]  
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{},
             // 修改表单的验证规则对象
            editFormRules:{
              attr_name:[ { required: true, message: '请输入参数名称', trigger: 'blur' },]  
            },
            // 控制按钮与文本框的显隐
            inputVisible:false,
            // 文本框的输入内容
            inputValue:'',
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类列表
     async  getCateList(){
         const {data:res} = await  this.$http.get('categories')
         if(res.meta.status!==200){
             return this.$message.error('获取商品分类列表失败！')
         }
         this.catelist=res.data
         console.log(this.catelist)
       },
    //    级联选择框选中事件
    handleChange(){
        //    console.log(this.selectedCateKeys)
       this.getParamsData()
       },
        //    tab点击事件出来函数
     handleTabClick(){
            // console.log(this.activeName)
            this.getParamsData()
        },
        // 获取参数的列表数据,发送请求
      async  getParamsData(){
             //控制级联选择器的选中范围只能选中三级分类
        if(this.selectedCateKeys.length!==3){
            this.selectedCateKeys=[]
            this.manyTableData=[]
            this.onlyTableData=[]
            this.$message.warning('选中的不是三级分类!')
            return
        }
        // 证明选中的是三级分类,此时需要根据所选分类的ID,和当前所处的面板,获取对应的参数,发送请求
      const {data:res} = await  this.$http.get(`categories/${this.cateId}/attributes`,{
            params:{
                sel:this.activeName
            }
        })
        if(res.meta.status!==200){
            return this.$message.error('获取失败!')
        }
      res.data.forEach(item=>{
        //   先对要分割的字符串进行判断,若为空则不分割,直接返回空数组
         item.attr_vals=item.attr_vals? item.attr_vals.split(','):[]
         //控制文本框的显示与隐藏,通过修改数据列表的方式实现,不然修改一个数据,其他所有的数据会被同时修改
         item.inputVisible=false
         item.inputValue=''
      })
        console.log(res.data)
        if(this.activeName==='many'){
            this.manyTableData=res.data
        }else{
            this.onlyTableData=res.data
        }
        
        },
        // 监听对话框的关闭事件
        addDialogClose(){
            this.$refs.addFormRef.resetFields()
        },
          // 点击按钮添加参数
    addParams(){
        this.$refs.addFormRef.validate(async valid=>{
            if(!valid) return
           const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                attr_name:this.addForm.attr_name,
                attr_sel:this.activeName,
            })

            if(res.meta.status!==201){
                return this.$message.error('添加参数失败!')
            }
            this.$message.success('添加参数成功!')
            this.addDialogVisible = false
            this.getParamsData()
        })
    },
    // 点击编辑弹出对话框
  async  showEditDialog(id){
        // 查询当前参数的信息
      const {data:res} =await  this.$http.get(`categories/${this.cateId}/attributes/${id}`,{
            params:{
                attr_sel:this.activeName
            }
        })
        if(res.meta.status!==200){
            return this.$message.error('编辑参数失败!')
        }
        this.editForm=res.data
        this.editDialogVisible=true
    },
    // 编辑对话框的关闭事件
    editDialogClose(){
        this.$refs.editFormRef.resetFields()
        this.editDialogVisible=false
    },
    // 点击按钮,确认修改参数信息
    editParams(){
        this.$refs.editFormRef.validate(async valid=>{
            if(!valid) return
           const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
              attr_name:  this.editForm.attr_name,
              attr_sel:this.activeName
            })
            if(res.meta.status!==200){
                return this.$message.error('修改参数失败!')
            }
            this.$message.success('修改成功!')
            this.getParamsData()
               this.editDialogVisible=false
        })
    },
    // 删除事件
    async removeParams(id){
        const confirmResult =await  this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
        if(confirmResult!=='confirm'){
            return this.$message.info('已取消删除!')
        }else{
          const {data:res} = await  this.$http.delete(`categories/${this.cateId}/attributes/${id}`)
          if(res.meta.status!==200){
              return this.$message.error('删除失败!')
          }
          this.$message.success('删除成功!')
          this.getParamsData()
        }
    },
    // 文本框失去焦点与按下enter都会触发事件
  async  handleInputConfirm(row){
        if(row.inputValue.trim().length===0){
            row.inputValue=''
            row.inputVisible = false;
            return
        }
    //   如果没有return,
        row.attr_vals.push(row.inputValue.trim())   
        row.inputValue=''
        row.inputVisible = false;
    // 则需进行进一步的http请求,此处将公共请求统一提取到saveAttrVal()函数中
    //   const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
    //         attr_name:row.attr_name,
    //         attr_sel:row.attr_sel,
    //         attr_vals:row.attr_vals.join(',')
    //     })
    //     if(res.meta.status!==200){
    //         return this.$message.error('修改参数失败')
    //     }
    //     this.$message.success('修改参数成功!')
    this.saveAttrVals(row)

    },

    // 将对attr_val的操作,保存到数据库中
  async  saveAttrVals(row){
         const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
            attr_name:row.attr_name,
            attr_sel:row.attr_sel,
            attr_vals:row.attr_vals.join(',')
        })
        if(res.meta.status!==200){
            return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功!')
    },
    //    点击按钮,显示文本输入框 
      showInput(row) {
        row.inputVisible = true;
    //    让文本框自动获得焦点
    // $nextTick:当页面上元素被重新渲染之后,才会执行回调函数中的代码
        this.$nextTick(()=> {
            this.$refs.saveTagInput.$refs.input.focus();
            });
    },
    // el-tag删除事件
    handleClose(i,row){
        row.attr_vals.splice(i,1)
       this.saveAttrVals(row)
    }
    },
  


    computed:{
        // 如果按钮需要被警用,则返回true,否则返回false
       isBtnDisabled(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
       },
    // 当前选中的三级分类的id
    cateId(){
          if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
    },
    // 动态/静态计算dialog标题的文本
    titleText(){
        if(this.activeName==='many'){
            return '动态参数'
        }
        return '静态属性'
    }
    }

}
</script>

<style lang="less" scoped>
.el-row{
margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.el-input{
    width: 120px;
}
</style>